Add AUIB_AUI_OVERRIDE_VERSION in addition to AUIB_AUI_AS

[Alex2772]

When using AUIB_AUI_AS in order to develop AUI alongside with AUI based (client) application, I often make commits to AUI. I also have to update commit sha1 (version) in auib_import(AUI) in the client application, so other developers would receive AUI update. However, the local AUI repository location on my machine is also updated, and I have to do git remote origin set-url in AUI's repository in order to make commit every time. The idea is to override the AUI version only on my machine with CMake argument, so the repository wouldn't updated when I update AUI version in the client application, and I wouldn't have to setup remote origin url in order to make a commit to AUI.